Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 21, Problem 3FTB
Seedless vascular plants must reproduce when conditions are wet because their sperm must. Two adaptations that allow seed plants to reproduce more efficiently on dry land are and. The seed plants fall into two major categories: the nonflowering and the flowering. Flowers were favored by natural selection because they. Fruits were favored by natural selection because they.
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Flowers whose throats (nectaries) are too long for hummingbirds to reach their nectar are unlikely to be pollinated (nectar reward isn't available) and therefore the flower is unlikely to reproduce. But if the nectaries are too short, hummingbirds can get their nectar without pollinating them because they don't reach in far enough to touch the pollen-carrying anthers, thus no reproduction for the flower. Flowers evolve with an intermediate length of nectaries. This is an example of what sort of selection?
Group of answer choices
Disruptive
Stabilizing
Directional
Sexual
Put the following 3 fictional plants in order from earliest to most recent according
to their characteristics:
A. The Terpad Plant: This plant reproduces using spores and has proper leaves and
vascular tissue.
B. The Feltris Plant: The Feltris plant lives in moist environments since it doesn't
have any vascular tissue to maintain hydration throughout the plant. This plant has
no roots either but has small root-like structures called rhizoids which help anchor
them to the ground. Water is also required in order for fertilization.
C. The Lancelot Plant: This plant can grow in either moist or dry environments, has
true roots, stems and leaves and reproduces via seeds which develop within an
ovary.
Most angiosperms incorporate the assistance of animals in their reproductive cycle. This is a major advancement that gave them an advantage over other plant lineages and helped them become the dominant type of plant on Earth today. Which of the following steps in the reproduction of angiosperms do animals assist with? Check all that apply.
Pollination
Fertilization
Seed dispersal
Chapter 21 Solutions
Biology: Life on Earth
Ch. 21 - 1. Scientists hypothesize that the ancestors of...Ch. 21 - Plant adaptations to life on land include a(n)...Ch. 21 - 3. Seedless vascular plants must reproduce when...Ch. 21 - 4. Three groups of nonvascular plants are _______,...Ch. 21 - 1. What is meant by “alternation of generations”?...Ch. 21 - 2. Explain the evolutionary changes in plant...Ch. 21 - Describe evolutionary trends in the life cycles of...Ch. 21 - Prob. 4RQCh. 21 - List the structural adaptations necessary for the...Ch. 21 - The number of species of flowering plants is...
Ch. 21 - List the adaptations of gymnosperms that have...Ch. 21 - What is a pollen grain? What role has it played in...Ch. 21 - The majority of all plants are seed plants. What...Ch. 21 - You are a geneticist working for a firm that...Ch. 21 - 1. Prior to the development of synthetic drugs,...Ch. 21 - 2. Only a few hundred of the more than 200,000...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesarrow_forwardSeedless vascular plants must reproduce when conditions are wet because their sperm must_______________ . Two adaptations that allow seed plants to reproduce more efficiently on dry land are_________ and_________ . The seed plants fall into two major categories: the nonflowering_______________ and the flowering_________ . Flowers were favored by natural selection because they__________ . Fruits were favored by natural selection because they_____________ .arrow_forwardThe picture below shows a branch of Douglas fir, an evergreen tree of the Phylum Coniferophyta. Based on this picture, which of the following answers is true? O only staminate cones are visible O only ovulate cones are visible O both ovulate and staminate cones are visible O neither ovulate and staminate cones are visiblearrow_forward
- Which of the following statements regarding plants is not correct? * Diploid plants produce haploid spores by mitosis. Gametophytes are haploid. Flower is the reproductive organ in plants. All plants have a life cycle with alternation of generations.arrow_forwardWhich of the following observations would provide the strongest evidence that two plants belong to different biological species? * here are variations in their RNA sequences. The leaves and flowers show morphological differences. They produce viable but sterile offspring. They occupy unique habitats in an ecosystem.arrow_forwardImagine that you are a member of a research group conducting research on fruit type and seed dispersal. Your group has submitted a paper to a peer-reviewed journal that addresses the factors that impact fruit type and seed dispersal mechanisms in plants of Central America. The editor of the journal communicates that your paper may be published if you make ‘minor revisions’ to the document.Unit 8 DQ Question: Why is seed dispersal important in the life of plants? What would be the consequences of having seeds that simply fell to the ground underneath the parent tree? (Editor’s note: addressing this question will provide needed background information to the ‘Introduction’ of your paper).arrow_forward
- Which of the following referes to the principle of alternation of generations in plants? A life cycle that includes a unicellular haploid stage. A life cycle that includes a multicellular haploid stage. The differences between a tree and a seed. The need for external pollinators. Gemete-producing sporophytes.arrow_forwardImagine a plant that has been well adapted to a particular habitat, and it has been reproducing only asexually; thus, all of its offspring are identical to it. If the climate or other conditions change such that the plant can no longer survive in the new conditions, what will happen to all of its offspring? Why?arrow_forwardTheophrastus of Lesbos, Aristotle’s successor as head of the Lyceum, improved upon Aristotle’s botany by classifying all monocotyledons as flowering plants with: two seed-leaves in the embryo, branching leaf veins, and flower parts in multiples of 4 or 5 one seed-leaf in the embryo, branching leaf veins, and flower parts in multiples of 4 or 5 one seed-leaf in the embryo, parallel leaf veins, and flower parts in multiples of 3 or 6 two seed-leaves in the embryo, parallel leaf veins, and flower parts in multiples of 3 or 6 two seed-leaves in the embryo, branching leaf veins, and flower parts in multiples of 3 or 6arrow_forward
- An alternation of generation life cycle in plants is advantageous because: each generation is morphologically similar. it protects reproductive structures. the gametes fuse in open water. it is haploid-dominant.arrow_forwardWhat would happen to a plant that had a mutation preventing it from being able to perform phototropism? Compare to a plant with a mutation that allows it to do phototropism more quickly than other plants. Explain in terms of natural selection.arrow_forwardThe following questions refer to the generalized life cycle for land plants shown in the figure below. Each number within a circle or square represents a specific plant or plant part, and each number over an arrow represents either meiosis, mitosis, or fertilization. 6. (5) 2n 8. ndlor, 12 10 8. In the figure above, which number represents the mature gametophyte? O 1 O 7 O 3 O 1 MacBook Pro G Search or type URL %23 24 * 3 4 W E Yarrow_forward
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